Population inversion in fluorescing fragments of super-excited molecules inside an air filament*
See-Leang Chinb), Huai-Liang Xua)†
Fig.#cod#x0A0;3. Backward integrated fluorescence signal at around 430#cod#x0A0;nm versus filament length for 2 % of hydrocarbons a C 2 H 4 , b CH 4 , and c C 2 H 2 in air. [ 4 ]